ClusterDumper: profit from C++20 to_array

The title says it all ..

This merge request affects 1 package:

• Event/xAOD/xAODCaloEventCnv

This merge request affects 1 file:

• Event/xAOD/xAODCaloEventCnv/src/ClusterDumper.cxx

Adding @damazio ,@akraszna ,@dossantn as watchers

added EDM main review-pending-level-1 labels

CI Result SUCCESS (hash 7e0fe271)

	Athena	AthSimulation	AthGeneration
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9117] (remote access info)

Approved from L1

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit eabf31b9